How Do You Calculate Cannonball Trajectory from a Cliff?

[Timmy96]

Homework Statement

A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations

What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution

I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.

 

[SteamKing]

Homework Statement

A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations

What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution

I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.

What happens to the cannon ball after it is fired; that is, what forces are acting on the ball itself while it is aloft?

 

[Timmy96]

just gravity

 

[BvU]

Good. Now write down some relevant equations under 2. And show what you have done under 3.